Finding the Fourth Proportional to 172,435.17, 258,663.69 and 54,111.18

Step by Step Solution

1. Step 1: Write the proportion equation
   172,435.17 : 258,663.69 = 54,111.18 : x
2. Step 2: Convert to fraction form
   172,435.17/258,663.69 = 54,111.18/x
3. Step 3: Cross multiply
   172,435.17x = 258,663.69 × 54,111.18
4. Step 4: Simplify right side
   172,435.17x = 13,996,597,353.78
5. Step 5: Solve for x
   x = 13,996,597,353.78/172,435.17
6. Step 6: Final answer
   x = 81,170.20